Slightly imporved pyrepl (#1296)

* removed unnecessary getAttribute
  * removed unnecessary shadow and ShadowDOM in general, as it was never used
  * dropped redundant constructor
  * removed unnecessary usage of the label element
  * fixed redundant always-same buttons IDs

pyscriptjs/src/components/pyrepl.ts

@@ -6,7 +6,7 @@ import { keymap, Command } from '@codemirror/view';
 import { defaultKeymap } from '@codemirror/commands';
 import { oneDarkTheme } from '@codemirror/theme-one-dark';
 
-import { getAttribute, ensureUniqueId, htmlDecode } from '../utils';
+import { ensureUniqueId, htmlDecode } from '../utils';
 import { pyExec } from '../pyexec';
 import { getLogger } from '../logger';
 import { InterpreterClient } from '../interpreter_client';
@@ -20,31 +20,20 @@ export function make_PyRepl(interpreter: InterpreterClient, app: PyScriptApp) {
     /* High level structure of py-repl DOM, and the corresponding JS names.
 
            this             <py-repl>
-           shadow               #shadow-root
-                                    <slot></slot>
            boxDiv               <div class='py-repl-box'>
-           editorLabel              <label>...</label>
            editorDiv                <div class="py-repl-editor"></div>
            outDiv                   <div class="py-repl-output"></div>
                                 </div>
                             </py-repl>
     */
     class PyRepl extends HTMLElement {
-        shadow: ShadowRoot;
         outDiv: HTMLElement;
         editor: EditorView;
         stdout_manager: Stdio | null;
         stderr_manager: Stdio | null;
 
-        constructor() {
-            super();
-        }
-
         connectedCallback() {
             ensureUniqueId(this);
-            this.shadow = this.attachShadow({ mode: 'open' });
-            const slot = document.createElement('slot');
-            this.shadow.appendChild(slot);
 
             if (!this.hasAttribute('exec-id')) {
                 this.setAttribute('exec-id', '0');
@@ -77,7 +66,7 @@ export function make_PyRepl(interpreter: InterpreterClient, app: PyScriptApp) {
                 ]),
             ];
 
-            if (getAttribute(this, 'theme') === 'dark') {
+            if (this.getAttribute('theme') === 'dark') {
                 extensions.push(oneDarkTheme);
             }
 
@@ -97,10 +86,8 @@ export function make_PyRepl(interpreter: InterpreterClient, app: PyScriptApp) {
             boxDiv.className = 'py-repl-box';
 
             const editorDiv = this.makeEditorDiv();
-            const editorLabel = this.makeLabel('Python Script Area', editorDiv);
             this.outDiv = this.makeOutDiv();
 
-            boxDiv.append(editorLabel);
             boxDiv.appendChild(editorDiv);
             boxDiv.appendChild(this.outDiv);
 
@@ -109,35 +96,21 @@ export function make_PyRepl(interpreter: InterpreterClient, app: PyScriptApp) {
 
         makeEditorDiv(): HTMLElement {
             const editorDiv = document.createElement('div');
-            editorDiv.id = 'code-editor';
             editorDiv.className = 'py-repl-editor';
+            editorDiv.setAttribute('aria-label', 'Python Script Area');
             editorDiv.appendChild(this.editor.dom);
 
             const runButton = this.makeRunButton();
-            const runLabel = this.makeLabel('Python Script Run Button', runButton);
-            editorDiv.appendChild(runLabel);
             editorDiv.appendChild(runButton);
 
             return editorDiv;
         }
 
-        makeLabel(text: string, elementFor: HTMLElement): HTMLElement {
-            ensureUniqueId(elementFor);
-            const lbl = document.createElement('label');
-            lbl.innerHTML = text;
-            lbl.htmlFor = elementFor.id;
-            // XXX this should be a CSS class
-            // Styles that we use to hide the labels whilst also keeping it accessible for screen readers
-            const labelStyle = 'overflow:hidden; display:block; width:1px; height:1px';
-            lbl.setAttribute('style', labelStyle);
-            return lbl;
-        }
-
         makeRunButton(): HTMLElement {
             const runButton = document.createElement('button');
-            runButton.id = 'runButton';
             runButton.className = 'absolute py-repl-run-button';
             runButton.innerHTML = RUNBUTTON;
+            runButton.setAttribute('aria-label', 'Python Script Run Button');
             runButton.addEventListener('click', this.execute.bind(this) as (e: MouseEvent) => void);
             return runButton;
         }
@@ -161,13 +134,13 @@ export function make_PyRepl(interpreter: InterpreterClient, app: PyScriptApp) {
             // execute the python code
             app.plugins.beforePyReplExec({ interpreter: interpreter, src: pySrc, outEl: outEl, pyReplTag: this });
             // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
-            const pyResult = (await pyExec(interpreter, pySrc, outEl)).result;
+            const { result } = await pyExec(interpreter, pySrc, outEl);
             app.plugins.afterPyReplExec({
                 interpreter: interpreter,
                 src: pySrc,
                 outEl: outEl,
                 pyReplTag: this,
-                result: pyResult, // eslint-disable-line @typescript-eslint/no-unsafe-assignment
+                result, // eslint-disable-line @typescript-eslint/no-unsafe-assignment
             });
 
             this.autogenerateMaybe();
@@ -190,7 +163,7 @@ export function make_PyRepl(interpreter: InterpreterClient, app: PyScriptApp) {
 
                 //Attributes to be copied from old REPL to auto-generated REPL
                 for (const attribute of ['root', 'output-mode', 'output', 'stderr']) {
-                    const attr = getAttribute(this, attribute);
+                    const attr = this.getAttribute(attribute);
                     if (attr) {
                         newPyRepl.setAttribute(attribute, attr);
                     }